12551021 has 8 divisors (see below), whose sum is σ = 14649600. Its totient is φ = 10528848.

The previous prime is 12551017. The next prime is 12551053. The reversal of 12551021 is 12015521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12551021 - 2² = 12551017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18746 + ... + 19403.

It is an arithmetic number, because the mean of its divisors is an integer number (1831200).

Almost surely, 2^12551021 is an apocalyptic number.

It is an amenable number.

12551021 is a deficient number, since it is larger than the sum of its proper divisors (2098579).

12551021 is an equidigital number, since it uses as much as digits as its factorization.

12551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38203.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12551021 is about 3542.7420171387. The cubic root of 12551021 is about 232.3947710496.

Adding to 12551021 its reverse (12015521), we get a palindrome (24566542).

The spelling of 12551021 in words is "twelve million, five hundred fifty-one thousand, twenty-one".